fix(settings): show offline hint on Passkeys, clearer API key web-only message

Passkeys was the only implemented section missing the standard offline
banner. Reworded the API key create/delete popup to state plainly it's
only supported on Outline's web version, matching Passkeys' own phrasing
style instead of the more roundabout original wording.

Outpost/Features/Account/SettingsView.swift

@@ -743,6 +743,10 @@ struct SettingsView: View {
                 .foregroundStyle(.secondary)
                 .frame(maxWidth: 480, alignment: .leading)
 
+            if !isEffectivelyOnline {
+                offlineSettingsHint
+            }
+
             Label("This setting can only be changed from the web version of Outline.", systemImage: "lock.fill")
                 .font(.callout)
                 .foregroundStyle(.secondary)
@@ -817,7 +821,7 @@ struct SettingsView: View {
         .alert("Manage API Keys on the Web", isPresented: $isShowingApiKeyWebOnlyNotice) {
             Button("OK") {}
         } message: {
-            Text("Creating and deleting personal API keys currently requires Outline's web app, the same way Passkeys does — this app can only display your existing keys for now. We may add this here in the future if Outline supports it or we add the right kind of authentication.")
+            Text("Creating and deleting personal API keys is only supported on the web version of Outline. This app can display your existing keys, but not create or delete them.")
         }
     }